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        // 100 的求和
        function sum(){
            let result = 0;
            for(let i =1;i <=100; i++){
               result = result + i;
            }
            console.log(result);
        }
        sum();

        // 作业：逢 7 过的函数,统计学生成绩的平均数,各种金字塔,补零案例,闰年
        
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